1854 $10 PR55 Cameo NGC. This piece may very well represent
a unique coin, as it is the first certified proof 1854 Liberty Head
eagle known, an issue of which Garrett and Guth write in the second
edition of their Gold Coin Encyclopedia:

"Mintage: Unknown (Unique?)
"The existence of a Proof 1854 eagle is highly doubtful.
Apparently, a set of Proof coins was presented to the city of
Bremen [Germany] in July 1854 in exchange for a group of coins
(presumably from Bremen). According to Walter Breen, the set was
liberated in 1945 and broken up, but this information remains
unsubstantiated. Although various 1854 Proof $1, $2.50, and $3
coins are known, none can be tied to that set, nor have any 1854
Proof half eagles, eagles, or double eagles ever been seen. The
Smithsonian does not have a Proof example of this
date."

Well, as the saying goes, "Seeing is believing," and one look at
this coin will remove any doubt. The full strike, deeply reflective
fields, profound contrast, and mint frost remaining on the devices
are all clearly characteristic of a proof impression. There
are numerous contact marks on each side, the most obvious and
largest on the obverse below Liberty's nose and in the left field.
The fields are bright yellow-gold with a bit of reddish tint.
Although we can find no provenance information for this coin, it
appears to be a recently graded piece, and the sole proof 1854
eagle graded at either NGC or PCGS. If this is indeed the Bremen
coin, it only begins to solve the mystery of what happened to the
other coins, and in any case it is a fascinating specimen in its
own right. Possibly unique -- a phrase we seldom
use.(Registry
values: P2) (PCGS# 88790)